Barndweller,
General practice is when skid equipped helicopters routinely use a helideck, a surface net is not recommended. Admittedly the net appeared to reduce the turn rate but only because the tie down snapped and he probably shut down pronto at the same time.
Reason: Front and/or more likely the back of the skids can easily get snagged in the surface net leading to dynamic rollover.
Ref: CAP 437 5th Edition Chapt 3, 1.2 Note at the bottom of the table.
Pilot did remarkably well though after the inadvertant lift off.
pp.